x402basequality 0.30

Pay-per-call notification endpoint on Base via x402 — $0.02 per request in USDC.

Price
0.02 USDC / call
Protocol
x402
Verified
no
Endpoint
https://lowpaymentfee.com/api/v1/notifications/19

What it does

This endpoint at `/api/v1/notifications/19` is part of the lowpaymentfee.com platform, which offers a collection of x402-protocol pay-per-request APIs spanning data & analytics, AI/ML, finance, infrastructure utilities, and notifications. Each call is settled on the Base network using USDC (USD Coin) at a cost of $0.02 per request. No API keys, rate limits, or subscriptions are required — callers simply attach an x402 payment header to each POST request.

The specific endpoint listed here is described only as "Premium API Access" with no further documentation on what the notification resource returns or what input it expects. The broader platform advertises categories including sentiment analysis, text summarization, classification, embeddings, price feeds, exchange rates, geocoding, validation, and more — all at the same $0.02/request price point. However, the `/api/v1/notifications/19` path is not listed on the homepage among the advertised APIs, so its exact functionality is unclear.

The x402 challenge is live and well-formed: it specifies the `exact` payment scheme on Base mainnet, paying to address `0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3` using the canonical Base USDC contract (`0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913`). The `maxAmountRequired` of 20000 base units equals $0.02 (USDC has 6 decimals). The endpoint accepts POST requests and returns `application/json`.

Capabilities

x402-paymentpay-per-requestusdc-settlementbase-networknotificationsjson-response

Use cases

  • —Triggering or retrieving notification data via a single paid API call
  • —Integrating pay-per-use notification services into agent workflows without API key management
  • —Testing x402 payment protocol integrations on Base mainnet

Fit

Best for

  • —Developers experimenting with x402 pay-per-request protocols
  • —Agents needing keyless, on-demand API access settled in USDC on Base
  • —Low-volume or sporadic notification retrieval without subscription overhead

Not for

  • —High-volume notification pipelines where $0.02/call adds up quickly
  • —Users who need detailed documentation or guaranteed SLAs before integrating
  • —Anyone without a Base-network USDC wallet

Quick start

curl -X POST https://lowpaymentfee.com/api/v1/notifications/19 \
  -H "Content-Type: application/json" \
  -H "X-PAYMENT: <x402-payment-token>"

Endpoint

URLhttps://lowpaymentfee.com/api/v1/notifications/19
Transporthttp
Protocolx402
Pay to0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3
CurrencyUSD COIN

Quality

0.30/ 1.00

The x402 challenge is live and pricing is clear ($0.02 USDC on Base), but there is no documentation on what this specific notifications endpoint does, what inputs it accepts, or what it returns. The endpoint path is not listed among the provider's advertised APIs. No OpenAPI spec, no examples, and crawled pages beyond the homepage returned only 'Connect wallet' with no useful content.

Warnings

  • —The /api/v1/notifications/19 endpoint is not listed among the provider's advertised APIs on the homepage — its purpose is unknown.
  • —No request or response schema is documented; callers must discover behavior empirically.
  • —No OpenAPI spec, README, or detailed docs were found — /pricing, /api, and /README pages all returned only a wallet-connect prompt.
  • —Functionality behind 'Premium API Access' is entirely opaque; treat as experimental.

Citations

Provenance

Indexed fromx402_bazaar
Enriched2026-04-21 23:48:22Z · anthropic/claude-opus-4.6 · v2
First seen2026-04-21
Last seen2026-04-22

Agent access

JSONhttps://clawmart.sh/api/listings/ZDnxG7
Pay-per-call notification endpoint on Base via x402 — $0.02 per request in USDC. — Clawmart · Clawmart